The book Dry-Farming; was written by author Widtsoe, John Andreas, 1872-1952 Here you can read free online of Dry-Farming; book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Dry-Farming; a good or bad book?
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The amount of water actually found in a given volume of air at a certain temperature, compared with the largest amount it can hold, is called the rela- tive humidity of the air. As shown in Chapter IV, the relative humidity becomes smaller as the rainfall decreases. The lower the relative humidity is at a given temperature, the more rapidly will water evaporate into the air. There is no more striking confirmation of this law than the fact that at a tem- perature of 90° sunstrokes and similar ai...lments are reported in great number from New York, while the people of Salt Lake City are perfectly comfort- 136 DRY-FARMING able. In New York the relative humidity in sum- mer is about 73 per cent; in Salt Lake City, about 35 per cent. At a high summer temperature evapora- tion from the skin goes on slowly in New York and rapidly in Salt Lake City, with the resulting discom- fort or comfort. Similarly, evaporation from soils goes on rapidly under a low and slowly under a high percentage of relative humidity.
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